| Cassini division | A conspicuous 1800-kilometer-wide gap between the outermost rings of Saturn.
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| equatorial jet | The high-speed, eastward, zonal wind in the equatorial region of Jupiter’s atmosphere.
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| Great Red Spot | A reddish elliptical spot about 40,000 km by 15,000 km in size in the southern hemisphere of the atmosphere of Jupiter. The Red Spot has existed for at least 31⁄2 centuries.
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| metallic hydrogen | A form of hydrogen in which the atoms have been forced into a lattice structure typical of metals. In the solar system,the pressures and temperatures required for metallic hydrogen to exist only occur in the cores of Jupiter and Saturn.
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| resonance | The repetitive gravitational tug of one body on another when the orbital period of one is a multiple of the orbital period of the other.
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| Roche distance | The distance from a planet or other celestial body within which tidal forces from the body would disintegrate a smaller object.
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| spokes | Dark, short-lived radial streaks in Saturn’s rings.
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| zonal winds | The pattern of winds in the atmosphere of a planet in which the pattern of wind speeds varies with latitude.
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